A balloon envelope, having a base layer of ethylene vinyl alcohol (EVOH) and a layer of a second material, that is not EVOH, bonded to at least a portion of an outer-facing surface of the EVOH layer, is provided. The second material may be polyethylene, or a biaxially-oriented polyethylene terephthalate, such as Mylar®. The envelope may also be provided with another layer of the second material bonded to at least a portion of an inner-facing surface of the EVOH layer. The combination of the EVOH layer and the layer of the second material may be less gas-permeable than the EVOH layer alone and the layer of the second material alone.
Double-layered balloon envelope
2016-10-25
Patent
Electronic Resource
English
IPC: | B64B LIGHTER-THAN-AIR AIRCRAFT , Luftfahrzeuge leichter als Luft |
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